Features Made with excellent production, prevent backflow of water and other media, no leakage. The product possess high hardness, not easy to deform with high safety factor. Adopt good‑quality materials, strong and durable, reusable and have a long service life. Uniform force, come without slipping during installation, explosion‑proof and pressure‑resistant. Possess a wide range of uses and suitable for many areas, such as air compressor. Specification: Item Type: Air Compressor Check Valve Material: Zinc alloyScope of Application: Air compressorThread Size: Approx. 20.5 x 16.5 x 10mm / 0.8 x 0.6 x 0.4in Package List:5 x Air Compressor Check Valve Package List 5 x Air Compressor Check Valve